Clumpiness enhancement of charged cosmic rays from dark matter annihilation with Sommerfeld effect

Understand

Boost factors of dark matter annihilation into antiprotons and electrons/positrons due to the clumpiness of dark matter distribution are studied in detail in this work, taking the Sommerfeld effect into account.

• It has been thought that the Sommerfeld effect, if exists, will be more remarkable in substructures because they are colder than the host halo, and may result in a larger boost factor.
• We give a full calculation of the boost factors based on the recent N-body simulations.
• Three typical cases of Sommerfeld effects, the non-resonant, moderately resonant and strongly resonant cases are considered.